CN106525281B - Optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence and temperature measuring method thereof - Google Patents
Optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence and temperature measuring method thereof Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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Abstract
The invention relates to an optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence and a temperature measuring method thereof, comprising a laser for providing excitation light, a first transmission optical fiber for transmitting the excitation light, a pyramid prism arranged at a temperature measuring position and used for collecting and separating up-conversion fluorescence, a second optical fiber for transmitting the up-conversion fluorescence and a fluorescence lifetime detecting device used for detecting fluorescence lifetime, wherein one end of the first transmission optical fiber is connected with the laser, the other end of the first transmission optical fiber is fixedly connected with the pyramid prism, one end of the second transmission optical fiber is fixedly connected with the pyramid prism, and the other end of the second transmission optical fiber is connected with the fluorescence lifetime detecting device. The invention has the beneficial effects that: the temperature measurement is carried out through the cooperation of the laser and the pyramid prism, the up-conversion fluorescence is separated through the pyramid prism, and the up-conversion fluorescence is transmitted to the fluorescence service life detection device, so that the corresponding temperature value is obtained.
Description
Technical Field
The invention relates to the field of optical fiber temperature measurement, in particular to an optical fiber temperature measurement device based on rare earth ion up-conversion fluorescence and a temperature measurement method thereof.
Background
Because some temperature measuring sites have a severe environment, such as high temperature, high voltage and high electromagnetic interference, even some temperature measuring sites have certain corrosiveness and radioactivity; or inflammable and explosive, etc., which is not suitable for the electronic temperature measuring equipment to work on site. To solve the above problem of temperature measurement in severe environments, many remote temperature measuring devices have been designed, such as: a remote infrared temperature measuring device, a remote wireless temperature measuring device, etc. However, these electronic devices have some critical drawbacks, such as the fact that the infrared temperature measurement device is easily interfered by space light, cannot automatically measure in real time, cannot enter a temperature measurement point with a narrow space, and generates electric sparks. The temperature measuring node of the wireless temperature measuring equipment is easy to be subjected to on-site electromagnetic interference, greatly influences the temperature measuring precision, even cannot measure the temperature, and has no corrosion resistance and radiation resistance.
In the fluorescence lifetime temperature measurement technology which has been developed in recent years, ultraviolet light or near ultraviolet light is used as pumping light to pump europium-containing rare earth fluorescent powder, so that the europium-containing rare earth fluorescent powder emits down-conversion fluorescence which is pink or red and the like. Then, the fluorescence is transmitted to a fluorescence lifetime detection device through a large-diameter optical fiber, so that the temperature of the temperature measuring point is converted. The technology can well solve the temperature measurement difficulty caused by various severe conditions on the temperature measurement site. However, because the fluorescence lifetime temperature measurement technology uses down-conversion fluorescence of europium-containing rare earth fluorescent materials, the pump light and the fluorescence wavelength are not in a low-loss window of the optical fiber, so that the loss of the optical fiber to the pump light and the fluorescence is large; based on the defects, the existing fluorescent life temperature measurement technology cannot realize long-distance temperature measurement, the temperature measurement distance can only reach tens of meters, so that the fluorescent life detection device must be installed at a place close to a temperature measurement site, the fluorescent life detection device is easily affected by a bad site, and the condition that the temperature measurement precision is reduced or even the fluorescent life detection device cannot work occurs.
In order to solve the above long-distance temperature measurement problem, an up-conversion luminescence technology using photo-excited rare earth ions, which is also called frequency up-conversion or up-conversion, is studied, that is, a process of irradiating a substance with light having a long wavelength to generate short-wavelength luminescence. The earliest luminescence research on rare earth ion up-conversion can be traced to the early 50 th century, and because of the unique advantages of rare earth up-conversion in laser output, night vision and other aspects, a plurality of research teams and scientific companies at home and abroad develop comprehensive and systematic research on the up-conversion luminescence characteristics and mechanisms of rare earth ions. At present, the up-conversion effect of rare earth ions has been applied to the fields of up-conversion laser output, up-conversion three-dimensional display, up-conversion infrared detection, up-conversion anti-counterfeiting technology and the like. The up-conversion luminescence mechanism mainly comprises excited state absorption, energy transfer, cooperative up-conversion, photon avalanche and the like, wherein the cooperative luminescence process generally occurs between two same kind of ions. This procedure was first described in YbPO by Nakazawa in 1970 4 Is found. As shown in fig. 1, the rare earth ions are pumped by using infrared or near infrared laser as a pump, and the rare earth ions a and b are respectively pumped to an excited state; the a and b ions in the excited state simultaneously transfer energy to a virtual excited state level, emit fluorescence of a corresponding wavelength (up-converted fluorescence), and the a and b ions transit back to the ground state through a non-radiative transition. It has been found that up-conversion of fluorescence does not occur after withdrawal of pump lightImmediately vanishes, but decays exponentially; the time elapsed to decay the fluorescence intensity to 1/e of the initial fluorescence intensity is referred to as fluorescence lifetime; studies have shown that there is a definite functional relationship between upconversion fluorescence lifetime and upconversion fluorescence material temperature. By utilizing the functional relation between the up-conversion fluorescence life and the temperature, the temperature of the corresponding up-conversion fluorescence material can be calculated only by measuring the up-conversion fluorescence life, thereby realizing temperature measurement.
Disclosure of Invention
The invention aims at overcoming the defects, and provides an optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence and a temperature measuring method thereof, which realize long-distance temperature measurement.
The invention solves the technical problems by adopting the scheme that: the utility model provides a fiber temperature measuring device based on fluorescence of rare earth ion up-conversion, includes a laser instrument that is used for providing the excitation light, is used for transmitting the first transmission optic fibre of excitation light, sets up and is used for collecting and separating the pyramid prism of up-conversion fluorescence with temperature measurement department, is used for transmitting the second optic fibre of up-conversion fluorescence and is used for detecting fluorescence life-span's fluorescence life-span detection device, first transmission optic fibre one end is connected with the laser instrument, and the other end is connected with pyramid prism fixed connection, second transmission optic fibre one end with pyramid prism fixed connection, the other end is connected with fluorescence life-span detection device.
Further, the pyramid prism is formed by cutting and processing glass, ceramic or crystal doped with rare earth ions, the pyramid prism is a right-angle triangular prism, and two upper right-angle edges of the right-angle prism are respectively plated with a pumping light high-reflection film and a first fluorescent high-reflection film; and two lower right-angle edges of the right-angle prism are respectively plated with a pumping light high-transmission film and a second fluorescent high-reflection film.
Further, the first transmission optical fiber and the second transmission optical fiber are respectively perpendicular to the upper right-angle side or the lower right-angle side of the pyramid prism.
Further, the rare earth ion is Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ Or Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ A combination of the above.
Further, yb is adopted 3+ And Er 3+ The fluoride glass is processed into a right-angle triangular prism, and the processing method comprises the following steps:
step S1 according to 53% ZrF 4 、18%BaF 2 、3%LaF 3 、3%A1F 3 、20%NaF、 1%YbF 3 、1% ErF 3 The molar fraction ratio of the components with the purity of 99.99 percent is weighed, m g is taken as the total, the components are placed in an agate mortar, wherein m is more than or equal to 10 and less than or equal to 1000, the mixture is fully ground for 1 hour to prepare a sample, and the sample is placed in a white jade dry pot;
step S2: adding a specific amount of SF into a Bai Yugan pot 6 Covering the white jade dry pot cover, and placing the white jade dry pot in a high-temperature hearth;
step S3: starting a high-temperature furnace, heating for 1 hour at 950 ℃, and then preserving heat for 1 hour at 770 ℃;
step S4: turning off the high-temperature furnace and naturally cooling;
step S5: taking out the cooled sample from the Bai Yugan pot, making into block glass and cutting to obtain the right-angle triangular prism.
Further, the laser is a pump laser, and the excitation light is pump light.
Further, the first transmission optical fiber and the second transmission optical fiber are quartz optical fiber, plastic optical fiber or nylon optical fiber.
Further, the fluorescence lifetime detection device comprises a main control chip, and a photoelectric conversion module, a display module and a communication module which are electrically connected with the main control chip and used for receiving the input of the second transmission optical fiber, wherein the photoelectric conversion module is electrically connected with the main control chip through a signal amplification module and an AD conversion module in sequence; the main control chip is electrically connected with an external PC through a communication module; the main control chip is also electrically connected with the laser.
Further, the photoelectric conversion module is a PIN photodiode; the main control chip is an MCU control chip.
The invention also provides a temperature measuring method of the optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence, which is characterized in that a pyramid prism is arranged at a temperature measuring position, a laser is started, light emitted by the laser is used as excitation light to be transmitted to the pyramid prism through a first transmission optical fiber, the excitation light vertically enters the pyramid prism to generate up-conversion fluorescence, the up-conversion fluorescence is emitted from the pyramid prism and coupled to a second transmission optical fiber, and the up-conversion fluorescence is transmitted to a fluorescence lifetime detecting device through the second transmission optical fiber to detect the up-conversion fluorescence lifetime, so that a temperature value corresponding to the temperature measuring position is obtained.
Compared with the prior art, the invention has the following beneficial effects:
(1) The temperature measurement is carried out through the change of an electric signal in the traditional temperature measurement mode without being influenced by electromagnetic interference, and the conditions of inaccurate temperature measurement, reduced temperature measurement precision and even incapability of normal work can be caused under the condition of strong electric or strong magnetic interference. The invention takes the law of the change of fluorescence life time of up-conversion fluorescence along with temperature as a temperature measurement principle, and relates to physical quantity related to light, which is not affected by strong electromagnetic interference.
(2) And the temperature of the inflammable and explosive environment is measured, so that the electronic device equipment generating electric sparks is far away from the temperature measuring point. The pyramid prism is arranged at the temperature measuring point, the distance between the laser and the fluorescence lifetime detector is far, and the distance can reach 100-1000 meters, namely the first transmission optical fiber and the second transmission optical fiber can be 100-1000 meters, so that the long-distance automatic temperature measurement is realized.
(3) Excitation light adopted by up-conversion fluorescence temperature measurement is infrared or near infrared light (such as wavelength of 480 nm and 1550 nm), the loss of the light in the wave band when the light propagates in the optical fiber is much smaller (about one tenth) than the loss of ultraviolet or near ultraviolet light (such as 395 nm) adopted in the existing ultraviolet light excitation down-conversion fluorescence temperature measurement technology when the light propagates in the optical fiber, and the loss of generated fluorescence in the optical fiber is similar or smaller, so that the up-conversion fluorescence temperature measurement can really realize long-distance temperature measurement.
(4) The invention adopts the laser, the first transmission optical fiber, the second transmission optical fiber and the like which are all common products with reliable technology, and can greatly reduce the cost of the up-conversion fluorescence temperature measuring equipment.
(5) The temperature measurement precision and the sensitivity are high, and because the up-conversion luminescence technology adopted by the invention has larger difference between the pumping light and the up-conversion fluorescence wavelength (the up-conversion fluorescence wavelength is about half of the pumping light wavelength, such as green light or red light generated by 980nm pumping light), the separation of the up-conversion fluorescence and the pumping light is easy to realize, thereby reducing the influence of the pumping light on the temperature measurement precision and the sensitivity and greatly improving the temperature measurement precision and the sensitivity.
Drawings
The patent of the invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of rare earth ions producing up-conversion fluorescence.
FIG. 2 is a control block diagram of a temperature measuring device according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a corner cube according to an embodiment of the present invention.
In the figure: 1-pyramid prisms; 2-a first transmission fiber; 3-a second transmission fiber; 4-a pump light highly reflective film; 5-a high-transmission film of pump light; 6-a first fluorescent highly reflective film; 7-a second fluorescent highly reflective film.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 3, an optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence of the present embodiment includes a laser for providing excitation light, a first transmission optical fiber 2 for transmitting excitation light, a pyramid prism 1 disposed at a temperature measuring place for collecting and separating up-conversion fluorescence, a second optical fiber for transmitting up-conversion fluorescence, and a fluorescence lifetime detecting device for detecting fluorescence lifetime, wherein one end of the first transmission optical fiber 2 is connected with the laser, the other end is fixedly connected with the pyramid prism 1, one end of the second transmission optical fiber 3 is fixedly connected with the pyramid prism 1, and the other end is connected with the fluorescence lifetime detecting device.
From the above, the beneficial effects of the invention are as follows: the pyramid prism 1 is arranged at the temperature measuring point, and the distance between the laser and the fluorescence lifetime detector is longer, so that the long-distance automatic temperature measurement is realized.
In this embodiment, the pyramid prism 1 is formed by cutting glass, ceramic or crystal doped with rare earth ions, the pyramid prism 1 is a right-angle triangular prism, and two upper right-angle edges of the right-angle prism are respectively plated with a pumping light high-reflection film 4 and a first fluorescent high-reflection film 6; the two lower right-angle edges of the right-angle prism are respectively plated with a pumping light high-transmission film 5 and a second fluorescent high-reflection film 7.
In this embodiment, the first transmission fiber 2 and the second transmission fiber 3 are respectively disposed perpendicular to the upper right-angle side or the lower right-angle side of the corner cube 1.
In this embodiment, the rare earth ion is Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ Or Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ A combination of the above. The existing down-conversion fluorescence lifetime temperature measurement method adopts europium-doped rare earth compound fluorescent materials which are all in powder form, so that the manufacturing of a temperature measurement probe, the stability of the probe and the accurate contact between the probe and a temperature measurement point are not facilitated; the up-conversion fluorescent material adopted by the invention is single-doped, double-doped or multi-doped transparent glass, ceramic or crystal, and the pyramid prism 1 can be simply, compactly and firmly combined with the optical fiber and can be accurately attached to a temperature measuring point.
In the present embodiment, yb is used 3+ And Er 3+ The fluoride glass is processed into a right-angle triangular prism, and the processing method comprises the following steps:
step S1: according to 53% ZrF 4 、18%BaF 2 、3%LaF 3 、3%A1F 3 、20%NaF、 1%YbF 3 、1% ErF 3 The molar fraction ratio of the components with the purity of 99.99 percent is weighed, m g is taken as the total, the components are placed in an agate mortar, wherein m is more than or equal to 10 and less than or equal to 1000, the mixture is fully ground for 1 hour to prepare a sample, and the sample is placed in a white jade dry pot;
step S2: adding a specific amount of SF into a Bai Yugan pot 6 Covering the white jade dry pot cover, and placing the white jade dry pot in a high-temperature hearth;
step S3: starting a high-temperature furnace, heating for 1 hour at 950 ℃, and then preserving heat for 1 hour at 770 ℃;
step S4: turning off the high-temperature furnace and naturally cooling;
step S5: taking out the cooled sample from the Bai Yugan pot, making into block glass and cutting to obtain the right-angle triangular prism.
Studies have shown that when Yb is irradiated with 976nm laser light 3+ ,Er 3+ When the fluoride glass sample is used, the sample emits strong green up-conversion fluorescence, and the wavelength of the up-conversion fluorescence is between 515nm and 545 nm. In order to make 976nm laser be better absorbed by the sample and radiate fluorescence, 976 nm-centered pumping light highly reflective film 4 is coated on the right-angle side of the rectangular prism sample. Meanwhile, in order to collect up-conversion fluorescence better, 530nm is plated on the right-angle upper side of the pyramid prism 1 made of the sample as the center, and a first fluorescent high-reflection film 6 with the bandwidth of 15nm is used for realizing high-efficiency separation of 976nm pump light and up-conversion fluorescence around 530 nm; meanwhile, a second fluorescent high-reflection film 7 for 530nm and a pumping light high-transmission film 5 for 976nm are plated on the lower right-angle side of the right-angle prism, so that the pumping light transmission of 976nm and up-conversion fluorescence of about 530nm are reflected. After the plating of the upper right-angle side and the lower right-angle side of the right-angle prism is finished, the pump light optical fiber and the fluorescent optical fiber are bonded together by ultraviolet curing glue and fixed with the bevel edge, so that the combined optical fiber plating right-angle prism is formed.
The central wavelength of the pump light is 976nm, the wavelength of up-conversion fluorescence is 515nm to 545nm, the first transmission optical fiber 2 selects a common communication single-mode quartz optical fiber with the diameter of 125 mu m as the pump light optical fiber, and the second optical fiber selects a multimode optical fiber with the diameter of 400 mu m as the up-conversion fluorescence transmission optical fiber.
The experimental study shows that the fluorescence lifetime of the up-conversion fluorescence of the sample is about 1700 microseconds at normal temperature, and the fluorescence lifetime is about 6 microseconds when the temperature is changed by one degree centigrade, so the conversion speed of the AD conversion module and the processing speed of the main control chip are required to be relatively low, STM32F103RCT6 is selected as the main control chip, and meanwhile, the singlechip has the AD conversion function of which the sampling period is 1 microsecond at the shortest, so that the AD conversion chip is not required to be additionally arranged. Meanwhile, the chip has a serial port communication function, and the RS232 communication function can be realized by only adding an RS232 level conversion chip outside.
In this embodiment, the laser is a pump laser, and the excitation light is pump light.
In this embodiment, the first transmission optical fiber 2 and the second transmission optical fiber 3 are all quartz optical fibers, plastic optical fibers or nylon optical fibers.
In this embodiment, the fluorescence lifetime detection device includes a main control chip, and a photoelectric conversion module, a display module and a communication module, which are electrically connected to the main control chip and are used for receiving the input of the second transmission optical fiber 3, where the photoelectric conversion module is electrically connected to the main control chip sequentially through a signal amplification module and an AD conversion module; the main control chip is electrically connected with an external PC through a communication module. The laser is electrically connected with the main control chip.
In this embodiment, the photoelectric conversion module is a PIN photodiode; the main control chip is an MCU control chip.
The invention also provides a temperature measuring method of the optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence, which is characterized in that the pyramid prism 1 is arranged at a temperature measuring position, a laser is started, light emitted by the laser is used as excitation light to be transmitted to the pyramid prism 1 through the first transmission optical fiber 2, the excitation light vertically enters the pyramid prism 1 to generate up-conversion fluorescence, the up-conversion fluorescence is emitted from the pyramid prism 1 and coupled to the second transmission optical fiber 3, and the up-conversion fluorescence is transmitted to a fluorescence lifetime detecting device through the second transmission optical fiber 3 to detect the up-conversion fluorescence lifetime, so that a temperature value corresponding to the temperature measuring position is obtained.
The invention provides a concrete implementation process of a temperature measuring device, which comprises the following steps:
the semiconductor laser with the center wavelength of 976nm is used as a pumping light source, and the laser can switch off laser output within 15 nanoseconds through one IO foot control of STM32F103RCT 6. Laser output by the 976nm laser is used as pump light, and is transmitted remotely through a quartz optical fiber (namely a first transmission optical fiber 2) with the diameter of 125 mu m, and then irradiated onto a right-angle triangular prism, and up-converted fluorescence is obtained on the right-angle triangular prism: by pumping light Yb 3+ ,Er 3+ Fluoride glassThe glass material is pumped to make it emit up-conversion fluorescence with wavelength between 515nm and 545 nm. The right-angle triangular prism is made of Yb 3+ And Er 3+ Right angle triangular prism cut from fluoride glass material. The first transmission optical fiber 2 and the second transmission optical fiber 3 are adhered to the right-angle triangular prism through ultraviolet curing glue. The right-angle triangular prism has the function of collecting up-conversion fluorescence, the up-conversion fluorescence can be emitted on the hypotenuse of the right-angle triangular prism, a quartz optical fiber with the diameter of 400 mu m is adopted as a second transmission optical fiber 3, the up-conversion fluorescence is transmitted for a long distance and then is incident into a fluorescence lifetime detection device with nanosecond precision, a PIN photodiode is adopted as a photosensitive element in the fluorescence lifetime detection device, and an optical signal is converted into an electrical signal, amplified for two times and then is input into an AD conversion module; the STM32F103RCT6 is used as a main control chip, the amplified electric signal is subjected to AD conversion to obtain a digital fluorescence attenuation curve, the main control chip extracts the fluorescence lifetime from the attenuation curve through an algorithm, and the obtained fluorescence lifetime can be converted into the actual temperature at the temperature measurement position through a preset fitting curve. Through practical verification, the detection device can detect fluorescence lifetime change of more than 10 nanoseconds, and corresponds to temperature change of 0.01 ℃. The STM32F103RCT6 has serial port communication function, and can realize RS232 communication function only by adding a MAX232 chip as an RS232 level conversion chip.
In summary, the optical fiber temperature measuring device and the temperature measuring method based on rare earth ion up-conversion fluorescence provided by the invention have the advantages of simple structure, low cost, high reliability and capability of realizing long-distance temperature measurement.
Claims (7)
1. An optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence is characterized in that: the device comprises a laser for providing excitation light, a first transmission optical fiber for transmitting the excitation light, a pyramid prism arranged at a temperature measuring position and used for collecting and separating up-conversion fluorescence, a second transmission optical fiber for transmitting the up-conversion fluorescence and a fluorescence lifetime detection device for detecting fluorescence lifetime, wherein one end of the first transmission optical fiber is connected with the laser, the other end of the first transmission optical fiber is fixedly connected with the pyramid prism, one end of the second transmission optical fiber is fixedly connected with the pyramid prism, and the other end of the second transmission optical fiber is connected with the fluorescence lifetime detection device;
the pyramid prism is formed by cutting and processing glass, ceramic or crystal doped with rare earth ions, and is a right-angle triangular prism, and pumping light high-reflection films and first fluorescent high-reflection films are respectively plated on two upper right-angle edges of the right-angle triangular prism; the two lower right-angle edges of the right-angle triangular prism are respectively plated with a pumping light high-transmission film and a second fluorescent high-reflection film;
the rare earth ion is Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ Or Er 3+ 、Yb 3+ 、 Pr 3+ 、Tm 3+ A combination of the above;
yb is adopted 3+ And Er 3+ The fluoride glass is processed into a right-angle triangular prism, and the processing method comprises the following steps:
step S1: according to 53% ZrF 4 、18%BaF 2 、3%LaF 3 、3%A1F 3 、20%NaF、 1%YbF 3 、1% ErF 3 The molar fraction ratio of the components with the purity of 99.99 percent is weighed, m g is taken as the total, the components are placed in an agate mortar, wherein m is more than or equal to 10 and less than or equal to 1000, the mixture is fully ground for 1 hour to prepare a sample, and the sample is placed in a white jade dry pot;
step S2: adding a specific amount of SF into a Bai Yugan pot 6 Covering the white jade dry pot cover, and placing the white jade dry pot in a high-temperature hearth;
step S3: starting a high-temperature furnace, heating for 1 hour at 950 ℃, and then preserving heat for 1 hour at 770 ℃;
step S4: turning off the high-temperature furnace and naturally cooling;
step S5: taking out the cooled sample from the Bai Yugan pot, making into block glass and cutting to obtain the right-angle triangular prism.
2. The rare earth ion upconversion fluorescence based optical fiber temperature measurement device according to claim 1, wherein: the first transmission optical fiber and the second transmission optical fiber are respectively perpendicular to the upper right-angle side or the lower right-angle side of the pyramid prism.
3. The rare earth ion upconversion fluorescence based optical fiber temperature measuring device according to claim 1, wherein: the laser is a pump laser, and the excitation light is pump light.
4. The rare earth ion upconversion fluorescence based optical fiber temperature measurement device according to claim 1, wherein: the first transmission optical fiber and the second transmission optical fiber are quartz optical fiber, plastic optical fiber or nylon optical fiber.
5. The rare earth ion upconversion fluorescence based optical fiber temperature measurement device according to claim 1, wherein: the fluorescence lifetime detection device comprises a main control chip, a photoelectric conversion module, a display module and a communication module, wherein the photoelectric conversion module, the display module and the communication module are electrically connected with the main control chip and are used for receiving the input of a second transmission optical fiber, and the photoelectric conversion module is electrically connected with the main control chip through a signal amplification module and an AD conversion module in sequence; the main control chip is electrically connected with an external PC through the communication module, and is also electrically connected with the laser.
6. The rare earth ion upconversion fluorescence based optical fiber temperature measurement device according to claim 5, wherein: the photoelectric conversion module is a PIN photodiode; the main control chip is an MCU control chip.
7. A method for measuring temperature of an optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence according to any one of claims 1 to 6, characterized in that: the method comprises the steps of setting a pyramid prism at a temperature measuring position, starting a laser, transmitting light emitted by the laser as excitation light to the pyramid prism through a first transmission optical fiber, enabling the excitation light to vertically enter the pyramid prism to generate up-conversion fluorescence, emitting the up-conversion fluorescence from the pyramid prism, coupling the up-conversion fluorescence to a second transmission optical fiber, and transmitting the up-conversion fluorescence to a fluorescence lifetime detection device through the second transmission optical fiber to detect the up-conversion fluorescence lifetime, so that a temperature value corresponding to the temperature measuring position is obtained.
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| CN106969854A (en) * | 2017-04-18 | 2017-07-21 | 大连世有电力科技有限公司 | Optical fiber temperature-measurement equipment pair fibre-optical probes |
| CN108168727B (en) * | 2017-12-27 | 2019-12-27 | 西北核技术研究所 | Low-temperature thermometer based on scintillation crystal and temperature calibration and measurement method thereof |
| CN108061608B (en) * | 2018-01-30 | 2019-04-30 | 哈尔滨工业大学 | The temp measuring method of anti-white light-emitting diodes interference based on the ultraviolet up-conversion fluorescence of thulium ion |
| CN112111275B (en) * | 2020-08-26 | 2022-01-14 | 复旦大学 | Temperature measurement method based on rare earth luminescent life temperature probe |
| CN113040896B (en) * | 2021-03-25 | 2022-07-05 | 中国计量大学 | Photo-thermal treatment and temperature monitoring integrated system with replaceable probe |
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